用于实现赝自旋极化波导的Babinet互补结构
Babinet-Complementary Structures for Implementation of Pseudospin-Polarized Waveguides
AI总结：
本文证明互补结构本征模间的电磁对偶性可诱导出赝自旋极化态，提出基于Babinet互补结构实现极宽带宽单向波导的方法，无需体电磁材料，并在微波频段验证了自旋滤波特性。
摘要：
在本研究中，我们证明了一个定理，指出互补结构本征模之间的电磁（EM）对偶性对应关系，会在围绕一个（或多个）任意平面保持镜面对称性的不同类型波导中，诱导出反向传播的自旋极化态。类似于支持拓扑非平庸的方向依赖自旋极化的光子拓扑绝缘体（PTI），我们的赝自旋极化系统支持表现出鲁棒性的单向态。然而，我们结构的优势在于，只需使用人工双阻抗表面即可在极宽带宽内实现。因此，无需体电磁材料。基于我们的理论，使用Babinet互补结构可以实现赝自旋极化波导的概念，涵盖从微波到THz频段。我们设计并开发了多种单向波导，并研究了微波频段的自旋滤波特性。
英文摘要：
In this work, we prove a theorem that states the electromagnetic (EM) duality correspondence between eigenmodes of complementary structures, induces counterpropagating spin-polarized states in different types of waveguides where mirror reflection symmetries are preserved around one (or more) arbitrary plane(s). Similar to photonic topological insulators (PTIs), which support topologically non-trivial direction-dependent spin polarizations, our pseudospin-polarized systems support one-way states that manifest robustness, however, the advantage of our structures is that they can be implemented in extremely broad bandwidth simply using artificial dual impedance surfaces. Consequently, there is no need to bulk electromagnetic materials. On the basis of our theory, the concept of the pseudospin-polarized waveguide can be realized using Babinet complementary structures, ranging from microwave to THz regime. We design and develop various unidirectional waveguides and spin-filtered feature in the microwave regime is investigated.
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